We have a 2005 24 foot Itasca Class C with over 46K miles on it and without slides that we bought new in 2006. We love it ... it's "our baby". We've taken a couple of long trips in it of 9000 miles (10 weeks) and 7000 miles (8 weeks). We're planning on another long trip this fall and an Alaska trip next year or the year after. In the year 2005 is when Ford switched to the their computer controlled 5-speed (6 speeds internal) TorqShift transmission with a Tow/Haul mode. Unfortunately you'll not be getting this transmission in a 2004 Ford based Itasca.
It's myself, the DW, and a small dog that travel in it. I'm 6'2" and use the cabover queen and find it very comfortable. I can almost sit up fully in the cabover queen. The DW has a bad back, so must sprawl out on the rear corner bed in order to get good sleep. The DW finds this rear corner queen bed - with the stock Winnebago-supplied mattress - more comfortable than the bed in our stickhouse $$$$ bed.
Ours has many options, including being on the optional E450 Ford chassis, which gives it great handling, breaking, and cooling ... but a bit stiff ride way back in the rear. The ride in the front cab is superb. Winnebago quality and workmanship is excellent in our rig - including the single piece fiberglass roof with rolled downward edges all along the length of each side for great roof leak prevention - which may still be under it's 10 year warranty.
Boy ... I guess prices are declining faster than I thought. I can't conceive of letting ours go for anywhere near $26K. Of course the Itasca you're considering has absolutely outstanding low mileage on it.
If it's in excellent condition (chassis and coach) with some options, I'd say it's a great deal. Plus ... if it's been stored under a roof (out of the sun) all that time when not being used ... I'd buy it in a heartbeat!